Two Layer Slate Roof

The entire field will be covered in slates lapped to form a weatherproof barrier of two layers of slate.

Two layer slate roof. Timbertex antique slate double layer hip and ridge cap roofing shingles 20 lin. Another argument in favor of two layers focuses on the amount of waste created from the job. The first course starts with an extra 1 2 wide run. Asphalt shingles typically can have one more layer added over the top two roofs total.

A re roof might not look good on an inspection report. So anywhere along the gable end that you can see the felt you ll see two layers. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. Individual slates are laid in rows along the roof.

First of all multiple layers of shingles simply means layering a new asphalt shingle roof on top of the old one rather than stripping the roof completely to expose the sheathing and replacing it with new shingles. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. Two layers is the maximum in most areas but some building codes allow only one. Since the second layer makes removal more difficult you will find roofers have to work longer to get the surface ready for a fresh layer of shingles creating higher labor costs the second time around.

Local codes might not allow re roofing. Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course. Pros to overlaying a shingle roof. Five best practices reasons for using roofing felt underlayment.

Ice water barrier this self adhering water proof and self sealing membrane is applied to the roof deck. For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers. Most often made out of plywood this roof layer is installed over the framing in a typical roof install. Slates should have a side lap of a minimum of 3.

It also works for vertical applications. It provides structure by tying the trusses and joists together. Order an extra 10 of underlayment to account for overlaps and waste. Minimum requirements for slopes 4 12 8 12 will require a double layer of 30 felt.

Per bundle 30 pieces the perfect finishing touch for your new roof the perfect finishing touch for your new roof should be a protective and distinctive ridge cap shingle. For many years it was acceptable to put even the third layer. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection. A double layer may be required in areas where hard driven rain more common.

Most building codes allow this but is it a good idea. Underlayment is sold by squares similar to roofing slate. Steep sloped roof products such as tile slate metal and shakes only allow one layer.